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Message: <blockquote data-quote="jwstl" data-source="post: 168600" data-attributes="member: 12977">I think that confuses a lot of people. Remember, focal length is a measure of distance from the film/sensor plane and that doesn't change as sensor size changes. A 24mm is 24mm away on DX and on FX. The focal length listed for DX is the actual focal length, not the "equivelant" focal length. Hence, the crop factor exists for them as well. Because DX lenses only have to cover the smaller sensor they can be made smaller, lighter, and less expensively. Those are the differences between DX and FX lenses.Sent from my iPad using Tapatalk HD</blockquote>